For AES key expansion for a 128-bit key of all ones, find the temp = w[3],...
For AES key expansion for a 128-bit key of all ones, find the temp = w[3], Subword(RotWord(temp)), Subword(RotWord(temp)) XOR Rcon(1) and W[4].
Note that i = 4
Homework Answers
Calculating w[4] :
Here, i = 4
temp = w[i-1] =w[3] = ffffffff
RotWord(temp) = ffffffff
SubWord(RotWord(temp)) = 16161616 (using the S-box table)
Rcon[4/4] = 01000000 (using round constant table)
XORing SubWord with Rcon[4/4] :
temp =16161616 XOR 01000000 = 17161616
XORing w[4-4] with temp we get w[4] ,
hence w[4] = w[0] XOR temp
= ffffffff XOR 17161616
= e8e9e9e9
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For AES key expansion for a 128-bit key of all ones, find the
temp = w[3],...
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